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• OATorTAT : Bus
• ObstacleClosureRate : Bus
• occupantControlAuthority : Ase
• occupantPitchControlAuthority : Bus
• occupantRollControlAuthority : Bus
• oldActiveLateralMode : FlightModeAnnunciator
• oldActiveVerticalMode : FlightModeAnnunciator
• oldAutopilotEngaged : FlightModeAnnunciator
• oldDesiredVsi : Afcs
• oldKeyboardState : Devices::Keyboard
• oldPitchAttitude : Afcs
• oldRollAttitude : Afcs
• onClear : Watch
• OnGround : Bus
• onPress : Devices::JoystickConfig::Button
• open : Door
• Ordinal : DEVICE_OBJECT
• orientation : Vehicle
• OutputDesc : WINDOW_OBJECT
• outputs : Devices::InterfaceKitConfig
• OUTPUTV : Devices::Apcupsd::STATUS